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History Daily

The Three Mile Island Nuclear Accident Begins

Mar 28, 2025
On March 28, 1979, a partial meltdown at Pennsylvania's Three Mile Island power plant triggered America's worst nuclear disaster. The newly elected governor faced chaotic public panic and misinformation while attempting to manage safety and radiation fears. Residents evacuated their homes as anxiety surged, further complicated by a hidden hydrogen gas bubble at the site. The accident prompted significant enhancements in nuclear safety protocols, reshaping the future of nuclear energy amidst ongoing concerns about trust and transparency.
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Quick takeaways

  • The Three Mile Island accident exposed critical deficiencies in operator training and emergency preparedness within the nuclear industry, revealing chaos during the crisis.
  • Governor Thornburg's management during the meltdown highlighted the challenges of public communication in a rapidly escalating disaster, promoting long-term regulatory reforms.

Deep dives

The Initial Incident at Three Mile Island

On March 28, 1979, a partial meltdown occurred at the Three Mile Island Nuclear Power Station due to a series of equipment failures and operator errors. Foreman Frederick Scheiman discovered a plumbing issue that led to the reactor overheating, which prompted a turbine and reactor trip. This triggered an emergency cooling system; however, a malfunctioning valve allowed coolant to escape, leaving the reactor overheated and at risk. As the incident unfolded, the workers faced confusion and chaos, revealing a significant lack of training and preparedness for such emergencies.

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